Hi Longy
The aim for the QU series was to make the patching as simple as possible. So when it came to USB patching for the QU32 there was a choice between either 1-24 mono inputs plus the stereo channels, or 32 mono inputs. The USB in Qu is fixed architecture so there isn’t a way implement this in patch as everything works 1 to 1.
A work around could be to use the internal sound card on a PC and patch into a stereo channel that way, which means you would have 32 mono inputs and the DAW master mix. On Mac you can create an aggregate sound card to combine the internal sound card with the QU which could be useful if you wanted to return your channels to the QU at the same time.
Here’s a link for that: https://support.apple.com/en-gb/HT202000
I hope this helps!
Thanks!
Alex